Lifting-jack



(No Model.)

T. THOM. LIPTING JACK.

i E UNiTELD STATESA PATENT OFFICE.

rnnonor. THoM, or EicHLAND, MINNEsoTA.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 287,066, dated October 28, 1883.

Application filed June 5, 1883. (No model.)

To a/ZZ whom t may concern:

Beit known that I, TnEoDoR THoM, a citizen of the United States, residing at Richland, in the county of Bice and State of Minnesota, have invented certain new and useful Improvements in Lifting-Jacks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being hadV to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in lifting-jacks; and it` consists in the construc-Y showing the lifting-bar and the pinion meshed,

and Fig. 8 shows the crank-pinion and gearwheel in detail.

The standard A is composed of the beams A A, mounted on a suitable base or foot, A3. These beams A A2 are clamped face to face in the manner hereinafter described, and are provided in their abutting or adjoining faces with grooves, which are formed to coincide and provide a way for the lifting-bar hereinafter described. The lifting-bar C is placed in the way formed within the beams A A2, and has on one of its edges the rack-teeth c, as shown in Fig. 7 On the top of this bar Ipreferably form the projecting pin c2, on which is swiveled the head or cap piece c3, which has its opposite ends turned up, so that it provides a convenient seat for the vehicle-axle,` and also to engage and hold the lifting-hook c", which is provided with a series of holes, as indicated by dotted lines c, Fig. 2, formed at diiferent points along it, near its upper end, so that its lower bent end, c5, may be set at any suitable point desired. The object of this bar c4, it will be understood, is to provide means for raising obj cets arranged in a position below the cappiece c3. Vhere so desired, several of the hooks c5 may be formed at various points along the bar. A2,. I form shoulders a a'. The side plates, B B', are rested against these shoulders and extend to the upper end of the standard A. The plate B is provided with bearings for the lifting and crank pinions, and also provides a support or pivot-pin, I, for the pawl hereinafter described. This plate B is also provided with a series of holes for the clamping-bolts b', which secure the plates and beams together, as well as for the tenons b2, formed on the ends of the bars b", projected from the plate B', as will be described. The upper edge of the plate B is turned over, so as to provide the iiange B, which extends to the edge of the lifting-bar way, and receives the friction as well as the lateral strain of said bar on one side of its way. The plate B also has its uppei` 'edge turned to provide the ange B4, which extends close to the edge of the liftingbar way, opposite the plate B, and serves a similar purpose on its side of the way to that of the flange B3. This plate B is also provided with the horizontal bars b3 b3 b3 b,which extend therefrom through the standard A, and are provided on their ends with the tenons b2, which extend through and rest in the openings formed therefor in the plate B, as will be understood on reference to the drawings, Figs. l, 3, and 4. The upper pair of these bars b3, as shown in Fig. 3, extend across the ends of the lifting-bar way iiush with the edges thereof, so that by means thereof, in connection with the iianges B3 B4, a continuous metallic bearing or face is provided around the upper opening of the lifting-bar way.

` The lifting-pinion D is provided with the shafts d d on its opposite ends, next to which I form the angular, preferably triangular, portions d d', between which portions I form the teeth d2. This pinion is supported in suitable bearings in the side plates, and is meshed with the rack-bar edge of the lifting-bar, so that the latter will be raised or lowered as the pinion D is suitably revolved. This pinion is made the same at both'ends, as shown in Fig. 6, and its lteeth are formed the same on their opposite faces, as shown in Fig. 7, so that as the said On the outer faces of the beams A IOO teeth become worn the pinion may be removed from its bearings in the side plates by unloosing the clamping-bolts of the latter, and be reversed so that the fresh or unworn edge may be brought to do the lifting in the action of the said pinion on the lifting-bar as the former is revolved. By this means the liftingpinion may be .made to last twice as long as Would be the case were only one edge of its teeth available.

The gear-wheel E is arranged in a suitable mortise formed in the outer side of the beam A, close to the inner side of the plate B, and turns close against the inner side of the said plate in the operation of the machine. This gear-wheel is provided with a central angular opening corresponding to the shape of the Vportion d of the pinion D, and the said Wheel is slipped on the angular portion d, and the Wheel E and pinion D are thus keyedtogther, and the motion of the former becomes that of the latter, as will be understood on reference to the drawings.

The crank-pinion F is provided with the end bearing, j', which rests in the plate B', and on its opposite end with the bearing portion f, bearing in t-hc plate B, and with the shank portion f2. rlhe teeth f mesh with those of the wheel E, and motion is communicated thereto and through the medium of the pinion -D to the rack lifting -bar. A ratchet- Wheel, G, is slipped on the angular shank portion f2, and then the crank G is slipped on. rIhis crank G is provided with two sockets, gg, for the shank, so that the crank may be made longer or shorter, as desired. A pawl, g2, is

pivoted on pin Z), and engages the teeth of the wheel G and prevents the backward movement of the crank-pinion and its connections when such motion is not desired.

rlhe operation of the device will be readily understood from the descriptionv before given. It is strongly made, and yet so that the several parts may be replaced or reversed as maybe desired.

Having thus described my invention, whatI claim, and desire to secure by Letters Patent, is-

l. The combination, substantially as described, of the standard A, composed of the beams A A', having grooves formed in their adjoining faces to provide a way for the lifting-bar, the lifting-bar C, having a rack edge and placed in thelsaid way, the side plate, B, having arms Z1 and bearings for the liftingpinion and the crank-pinion, the plate B, the reversible lifting -pinion, the crank pinion, and suitable retaining-bolts, all as and for the purposes set forth.

2; In a liftiiigjaek, the combination, substantially as hereinbefore set forth, of the liftingbar,the standard, the lifting-pinion, made the same at both ends and reversible, as described, and the operating mechanism, as specfied.

3. In a lifting-jack, the combination, substantially as hereinbefore described, of the standard having a mortise or way for the liftin g-bar formed therein, the plates B B, having their upper edges turned over close to the opposite sides of the lifting-bar way, forming metallic bearing-surfaces at the upper edge of said way, the lifting-bar, the cap-piece C3, swiveled thereon, and the lifting-hook provided with a hole or holes to engage the ends of the swiveled cap-piece, and having a hook or hooks formed thereon, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

frnnonon f rHoM.

Vitncsses:

J. B. QUINN, .PATRICK QUINN. 

